The team that makes our magic work is growing: will you be a part of it?

About us Stockholm HQ with a Madrid R&D; center, building a platform so any device with a secure chip can pay, access transit, enter buildings, etc.

Fidesmo

Pay is their flagship, launched with Visa, Mastercard, banks and wearable makers — powering Swatch Pay and Honor's smartwatch payments. Work spans tiny-footprint chip code up through scalable server code and iOS/Android/web/CLI clients, developed in-house under their own quality bar.

Backend team role building the services connecting to payment networks, transit authorities, and secure chips. You'd learn to implement cryptography correctly and manage keys securely in a highly concurrent environment, and take part in CI/DevOps. Agile process — you'd join design/implementation discussions, planning, and code reviews.





The expectation is you grow alongside more experienced developers until you own one or more subsystems and contribute to other projects/libraries. Open to experimenting with new tech; they'll train you in the languages, crypto, and domain knowledge needed.

Requirements University degree in computer science, maths, physics, or engineering

Comfortable with abstract thinking and complexity

Working knowledge of at least one programming language

Some server-side coding experience

Enjoys collaborative, small-team work with mutual code review

Comfortable working in English day-to-day

Nice to have Functional programming knowledge

Interest in cryptography and security tech

What's offered Onboarding with formal + on-the-job training alongside experienced developers

Central Madrid office, well connected by Cercanías/Metro/bus

Versátil hours and remote work

Restaurant tickets

25 days annual paid vacation

📌 Junior Backend Developer - Madrid
🏢 Fidesmo
📍 Madrid